Mechanism for piercing or shaping metallic ingots.



NO- 829,100. PATENTED AUG. 21, 1906- L. D. DAVIS. MECHANISM FOR PIERGING 0B SHAPING METALLIC INGO'IS.

APPLIUATION FILED SEPT. 3.1961.

V J 17.2 a db C 314mm 1/0 mo 4 flq e' UNITED STATES PATENT OFFICE.

LEONARD D. DAVIS. or ERIE. PENNSYLVANIA. MECHANISM FOR PIERCING OR SHAPING METALLIC INGOTS- Specification of Letters Patent.

Application filed September 3.1901. Serial No. 74,166.

To (all whom, it may concern.

Be it known that I, LEONARD 'D. DAVIs, a citizen of the United States, residin at Erie, in the county of Erie and State of ennsyl- Vania, have invented certain new and useful Improvements in Mechanisms for Piercing or Shaping Metallic Ingots; and I do hereby declare the followin to be a full, clear, and exact description 0 the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to mechanisms for shaping or piercing metallic ingots; and it consists in certain improvements therein which. will be hereinafter full described, and pointed out in the claim.

The object of the invention .is to pierce ingots or form ierced ingots with greater smoothness and thinner walls than has been heretofore aceom lished.

The invention is illustrated in the accompanying drawings as follows:

Figure 1 is a side elevation of a'piercin mill embodying my im rovement. Fig. 2 1s a horizontal section a ong the axis of the billet. i

Fig. 1: A A mark the disks. These are arranged eccentrically, so as to produce rotative and longitudinal action of the billet as it passes between them. The general arrangement of the disks is that of a common ing-mill, only the outlines of the disks eing shown. A mandrel B is arranged as common in these mills, and a billet C is shown partially pierced.

My improvement particularly relates to the forming or shaping of the disks, and this consists in arranging a ipping 0r divergent workin surface a a, W forward the billet, subjecting it to pressure rotatively. After the billet passes through this working surface it asses throu h a smoothing or finishing su ace a a. I ave found that a surface a a, arran ed with the contact-line a proximately par le] with the axis of the bil et, produces a much smoother tube than disks of other shapes. This is of great advantage and permits of the hot rolling of the tube in a mill-of this character to a point giving much thinner walls than with ,disks as ordinarily formed. The mandrel should extend between the smoothing portion a. I v

What I claim as new is In a mill for shaping or piercing metallic ingots the combination of a pair 0 disks set eccentrically to each other with divergent working surfaces and smoothing-sm'faces extending from the exit side of the Working surfaces said smoothin -surfaces forming contactines with the biliet approximately parallel to the axis of the billet, and a mandrel arrail ged in the pass between the smoothingsu aces.

In testimony whereof I affix my signature in presence of two witnesses.

LEONARD D. DAVIS.

Witnesses:

H. 0. Loan,

GRACE E. YARD.

ch grips and feeds 

